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Initializing a two dimensional std::vector
...BER, 4));
I should also mention uniform initialization was introduced in C++11, which permits the initialization of vector, and other containers, using {}:
std::vector<std::vector<int> > fog { { 1, 1, 1 },
{ 2, 2, 2 } };
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Get current date in milliseconds
...language you desire. Here is the list -
ActionScript (new Date()).time
C++ std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count()
C#.NET DateTimeOffset.UtcNow.ToUnixTimeMilliseconds()
Clojure (System/currentTimeMillis)
Excel / Go...
Java Annotations
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Also, are they unique to Java, is there a C++ equivalent?
No, but VB and C# have attributes which are the same thing.
Their use is quite diverse. One typical Java example, @Override has no effect on the code but it can be used by the compiler to generate a warning...
How to define a preprocessor symbol in Xcode
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For Xcode 9.4.1 and C++ project. Adding const char* Preprocessor Macros to both Debug and Release builds.
Select your project
Select Build Settings
Search "Preprocessor Macros"
Open interactive list
Add your macros and don't forget to...
Is there any performance reason to declare method parameters final in Java?
...e type, such as int, and inline them directly in the code just like with a C++ macro.
However, i have no clue if this is done in practice, but it could be done in order to save some memory.
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How to check if a file is empty in Bash?
... the shell cannot help you when you misspell, whereas a compiler like your C++ compiler can help you.
Notice incidentally that I have swapped the roles of empty.txt and full.txt, as @Matthias suggests.
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How to map atan2() to degrees 0-360
...(theta_rad/M_PI*180) + (theta_rad > 0 ? 0 : 360);
This should work in C++: (depending on how fmod is implemented, it may be faster or slower than the conditional expression)
theta_deg = fmod(atan2(y,x)/M_PI*180,360);
Alternatively you could do this:
theta_deg = atan2(-y,-x)/M_PI*180 + 180;
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Why is there no Tree class in .NET?
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@Veverke Perhaps you were thinking of C++ templates. .NET generics are runtime types.
– Tom Blodget
Sep 29 '16 at 12:46
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Deleting an object in java?
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Your C++ is showing.
There is no delete in java, and all objects are created on the heap. The JVM has a garbage collector that relies on reference counts.
Once there are no more references to an object, it becomes available for ...
“f” after number
...ter that this is a floating point number (I assume you are talking about c/c++ here). If there is no f after the number, it is considered a double or an integer (depending on if there is a decimal or not).
3.0f -> float
3.0 -> double
3 -> integer
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